How to automatically highlight auto numbered lists

[utorlee]

I have a document of 100 pages. There are countless numbered lists.
Some are numbered using auto numbering while some are not.
Is there any way I can turn all auto numbered lists into red colour using VBA or otherwise automatically?

That is, auto numbered lists are turned into
1. xxx
2. xxx
3. xxx

While those of manually numbered lists are not and remain
1. xxx
2. xxx
3. xxx

[Chas Kenyon]

Simplest method is if you used styles for your numbering, modify the style.